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# Rotational oscillator? ⏎ ⏎ ## Non-rigid rotor ⏎ https://sci.tanta.edu.eg/files/Microwave%20spectroscopy%20BSc-Lect-2.pdf irregular not-equidistant levels ⏎ ## Tunneling - https://en.wikipedia.org/wiki/Pyramidal_inversion ⏎ [Ammonia - more is different](http://www.tcm.phy.cam.ac.uk/~bds10/aqp/anderson72more_is_different.pdf) ⏎ # Parents ⏎ * TLS - pseudospin or spin of $SU(2)$?⏎
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